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arxiv: 2005.04655 · v1 · pith:AUMTUY4Fnew · submitted 2020-05-10 · ⚛️ nucl-ex · nucl-th

Spectroscopy of low spin states in 157Dy: Search for evidence of enhanced octupole correlations

S. N. T. Majola , R. A. Bark , L. Bianco , T. D. Bucher , S. P. Bvumbi , D. M. Cullen , P. E. Garrett , P. T. Greenlees
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D. Hartley J Hirvonen U. Jakobsson P. M. Jones R. Julin S. Juutinen S. Ketelhut B. V. Kheswa A. Korichi E. A. Lawrie P. L. Masiteng B. Maqabuka L. Mdletshe A. Minkova J. Ndayishimye P. Nieminen R. Newman B. M. Nyako S. S. Ntshangase P. Peura P. Rahkila L. L. Riedinger M. Riley D. Roux P. Ruotsalainen J. Saren J. F. Sharpey-Schafer C. Scholey O. Shirinda A. Sithole J.Sorri S. Stolze J. Timar J. Uusitalo G. Zimba
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classification ⚛️ nucl-ex nucl-th
keywords bandstructuresbandsbeenbuiltcorrelationslevelneutron
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Low-spin states of 157Dy have been studied using the JUROGAM II array, following the 155Gd ({\alpha}, 2n) reaction at a beam energy of 25 MeV. The level scheme of 157Dy has been expanded with four new bands. Rotational structures built on the [523]5/2- and [402]3/2+ neutron orbitals constitute new additions to the level scheme as do many of the inter- and intra-band transitions. This manuscript also reports the observation of cross I- to (I-1)- and I- to (I-1)+ E1 dipole transitions inter-linking structures built on the [523]5/2- (band 5) and [402]3/2+ (band 7) neutron orbitals. These interlacing band structures are interpreted as the bands of parity doublets with simplex quantum number s = -i related to possible octupole correlations.

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